CVE-2026-61670

MEDIUMPre-NVD 6.56.5
EchelonGraph scoreLOW confidence

This medium-severity CVE scores 6.5 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: secondary
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: —CVSS: 6.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

microsandbox is an easy, fast, local-first microVM runtime and library. Prior to 0.5.10, sdk/rust/lib/runtime/spawn.rs serializes NetworkConfig secret values into the --network-config argument and passes per-sandbox secrets through repeated --env arguments accepted by crates/cli/lib/sandbox_cmd.rs. Other local users or co-resident processes can read these values through the host process table, including /proc process command lines on Linux and process listings on Linux and macOS, for the lifetime of the sandbox. Exploitation does not require code execution inside the sandbox or access to the spawning user's session, and can disclose host-side API keys, tokens, and environment secrets on shared hosts, CI runners, and developer systems. This issue is fixed in version 0.5.10.

CVSS v3
6.5
EG Score
6.5(low)
EG Risk
34(Track)
EG Risk 34/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity65% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
—
EPSS %ILE
—
KEV
Not listed

Published

September 18, 2026

Last Modified

September 18, 2026

Advisory Details (6)

Auto-updated Sep 18, 2026
🔬 Proof of concept available. Patch available. Sources: github_commit, github_release, github, github_pr.
github_release Patch Available

v0.5.10

Patch available: superradcompany/microsandbox v0.5.10

https://github.com/superradcompany/microsandbox/releases/tag/v0.5.10
github_commit

commit fbfb2366bfaf (superradcompany/microsandbox)

Fix landed in superradcompany/microsandbox commit fbfb2366bfaf — awaiting tagged release

https://github.com/superradcompany/microsandbox/commit/fbfb2366bfafad5e6df8778183f95fd8ca3c00a4
github_commit

commit 2ac6a177b112 (superradcompany/microsandbox)

Fix landed in superradcompany/microsandbox commit 2ac6a177b112 — awaiting tagged release

https://github.com/superradcompany/microsandbox/commit/2ac6a177b11212d392bf1e7dc77aaf14e4768aa8
github_pr

feat(sandbox): move bulky config onto an inherited config fd

Fix merged in superradcompany/microsandbox PR #1006 on 2026-06-22 — awaiting tagged release

https://github.com/superradcompany/microsandbox/pull/1006
generic

Slim down the msb sandbox process command line (it's very long and hard to read) · Issue #997 · superradcompany/microsandbox · GitHub

https://github.com/superradcompany/microsandbox/issues/997
github Patch Available🟡 PoC Available

Secret values exposed in world-readable process arguments · Advisory · superradcompany/microsandbox · GitHub

https://github.com/superradcompany/microsandbox/security/advisories/GHSA-m8f5-rh7h-vgg3

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 3× in last 7d / 3× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-18 21:17 UTCEG score recompute
  2. 2026-09-18 20:50 UTCEG score recompute
  3. 2026-09-18 20:49 UTCMITRE cvelistV5first tracked

Frequently asked(4)

What is CVE-2026-61670?
CVE-2026-61670 is a medium vulnerability published on September 18, 2026. microsandbox is an easy, fast, local-first microVM runtime and library. Prior to 0.5.10, sdk/rust/lib/runtime/spawn.rs serializes NetworkConfig secret values into the --network-config argument and passes per-sandbox secrets through repeated --env arguments accepted by crates/cli/lib/sandbox_cmd.rs.…
When was CVE-2026-61670 disclosed?
CVE-2026-61670 was first published in the National Vulnerability Database on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-61670?
CVE-2026-61670 has a CVSS v3 base score of 6.5 (NVD). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-61670?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-61670, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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